División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, A.C, Camino a la Presa San José 2055, Col. Lomas 4a Sección, 78216, San Luis Potosi, SLP, Mexico.
Environ Sci Pollut Res Int. 2017 Sep;24(26):20922-20933. doi: 10.1007/s11356-017-9672-3. Epub 2017 Jul 18.
The effect of dissolved organic matter (DOM) and oil on the removal of the water-soluble compounds benzene, toluene, ethylbenzene, and xylene isomers (BTEX) by two low-cost biosorbents Macrocystis pyrifera and Ulva expansa) was evaluated. DOM decreased the adsorption capacity of toluene, ethylbenzene, and xylenes of the two biosorbents. In contrast, the removal of benzene increased under the same conditions in single and multi-solute systems: this effect was dominant in U. expansa biomass treatments. In the presence of DOM and oil in solutions, the removal of BTEX notoriously increased, being oil that contributed the most. Solubility and hydrophobicity of pollutants played a key role in the adsorption process. The attractions between BTEX molecules and biosorbents were governed by π-π and hydrophobic interactions. Affinities of biosorbents for BTEX were mainly in the order of X > E > T > B. The Langmuir and Sips equations adjusted the adsorption isotherms for BTEX biosorption in deionized and natural water samples, but in the case of oily systems, the Freundlich equation seemed to have a better fit. The biosorption processes followed a pseudo-second-order rate in all the cases.
研究了两种廉价生物吸附剂（巨藻和石莼）对水中溶解有机物（DOM）和油对苯、甲苯、乙苯和二甲苯异构体（BTEX）去除效果的影响。DOM 降低了两种生物吸附剂对甲苯、乙苯和二甲苯的吸附能力。相比之下，在单溶质和多溶质体系中，相同条件下苯的去除率增加：这种效应在石莼生物质处理中占主导地位。在含有 DOM 和油的溶液中，BTEX 的去除率显著增加，其中油的贡献最大。污染物的溶解度和疏水性在吸附过程中起关键作用。BTEX 分子与生物吸附剂之间的吸引力受π-π 和疏水性相互作用的控制。生物吸附剂对 BTEX 的亲和力主要顺序为 X > E > T > B。在去离子水和天然水样中，Langmuir 和 Sips 方程都可以很好地拟合 BTEX 的吸附等温线，但在油性体系中，Freundlich 方程似乎更合适。在所有情况下，吸附过程均遵循拟二级动力学。
